Steam-boiler



(No Model.)

G. W.'LONHOLDT. STEAM BOILER.

Patented Jan. 23, 1894.

2 Sheets-Sheet I.

Erin/$772678 (NoModeL) 2 Sheets-Sheet 2. G. W. LUNHOLDT.

STEAM BOILER.

No. 513,120. Patented Jan. 23, 1894,

Nrrs Tyres ATENT rare-a.

GEORG WILHELM LONHOLDT, OF BERLIN, GERMANY, ASSIGNOR TO THE -LOENHOLDTCOMPANY, OF CHICAGO, ILLINOIS.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 513,120, dated January23, 1894.

Application filed August 26, 1893. Serial. No. 484,134. (No model.)

To all whom it may concern: 1

Be it known that I, GEORG WILHELM Lou- HOLDT, a subject of the'Emperorof Germany, residing at Berlin, in the Empire of Germany, have inventeda new and useful Improvement in Steam-Boilers, of which the following isa specification.

V My invention relates to improvements in steam boiler furnaces. Steamboiler furnaces heretofore commonly in use are subject to two greatevils or objec- 'tions:'first, the incompletecombustion of the fuel,resulting in great waste and also great annoyance from smoke, and,second, great inury by burning and warping parts of the furnace or grateand of the boiler by reason of being subjected to uneven and great heat.

The object of my invention is to overcome these difficulties orobjections by a simple and durable construction and combination of theparts of the boiler furnace together; and to thls end my inventionconsists in the novel construction and combination of parts herein shownand described and more particularly pointed out in the claims-that is tosay my 1nvent1on consists in a steam boiler furnace, of the combinationwith the boiler of a furnace, fire pot, and along, narrow, hollowcentral combustion chamber projecting upward from the middle of thegrate, and having a slot or opening at the top through which the flameand products of combustion are drawn downward through the fire potbefore being proected against the heat absorbing surfaces of the boiler.The flame and products of combustion thus enter this long narrowcentral, upwardly projecting combustion chamber equallyfrom both sidesof the fire pot in sheets, and as the flame is drawn downward into, thefire proof body of the combustion chamber, the separate sheets of flameentering from opposite sides and crossing each other, are thoroughlymingled with each other, and also with a sufficient supply of freshheated air and all so connected together as they pass downward throughthe narrow combustion chamber that a complete combustion is effected;and by causing the flames to thus pass downward and concentrating themin a comparatively narrow combustion chamber and subsequently projectingthe flames against the heat absorbing surfaces of the boiler, the latterare protected against injury while at the same time the heat produced isutilized to the fullest extent and the absorption of the heat by theboiler is also prevented from interfering with the complete combustionof the fuel.

In the accompanying drawings, which form a part of thisspecification,and in which similar letters of reference indicate likeparts throughout the several figures, Figure 1 is a central verticallongitudinal section of a furnace boiler or boiler furnace embodying myinvention. Fig. 2 is a vertical cross section on line so 00 of Fig. 1and as to the right hand part on the lines 3 y of Fig. 1; and Fig. 3 isapartial longitudinal section taken on the line 3 3 of Fig. 1.

In the drawings A represents the steam boiler, B the grate, C the firepot, D the long narrow central upwardly projecting hollow combustionchamber extending upward into the fire pot from the grate and having aslot or opening d at the top through which the flames may enter fromeither side of thefire pot and pass down and through the combustionchamber, and thence into and through the flues E in contact with theboiler.

F represents the bridge wall at the rear end of the fire pot, the samehaving a slot or opening f at the lower portion communicating with thehollow combustion chamber D and through which the flame and products ofcombustion pass into the flue E which conducts the same to and againstthe boiler.

G represents the feed door, passage or opening through which the fuelmaybe fed into the fire pot. Through this or other suitable openingprovided for the purpose a sufficient supply of fresh air may beadmitted to the fire pot and thence into the combustion chamber D whereit will be mingled with the meeting and crossing sheets of flame andconcentrated therewith.

H is a valve or damper for controlling the admission of air to the firepot through the fresh heated air 1. In a boiler furnace, the combinationwith a steam boiler of a furnace grate, a fire pot and a long, narrow,hollow, central combustion chamber projecting upward from the middle ofthe grate or bottom of the fire pot, and having a slot or opening at thetop through which the flame and products of combustion are drawndownward in sheets from both sides of the fire pot through the same andcaused to cross and be concentrated together, and a flue or passageleading from said combustion chamber to the boiler, the fire pot beingwithout other exit passage than through said central combustion chambersubstantially as specified.

2. In aboilerfurnace, the combination with a steam boiler of a furnacegrate, a fire pot and a long, narrow, hollow, central combustion chamberprojecting upward from the middle of the grate or bottom of the firepot, and having a slot or opening at the top through which the flame andproducts of combustion are drawn downward in sheets from both sides ofthe fire pot through the same and caused to cross and be concentratedtogether, and a flue or passage leading from said combustion chamber tothe boiler, said boiler furnace being also provided with means foradmitting fresh air into said fire pot and thence into said upwardlyprojecting combustion chamber, the fire pot being without other exitpassage than through said central combustion chamber substantially asspecified.

3. In a boiler furnace, the combination of a steam boiler A, with grateB, fire pot 0, upwardly projecting hollow, narrow combustion chamber D,and a flue E leading from said combustion chamber D to the boiler, thefire pot being without other exit passage than through said centralcombustion chamber substantially as specified.

In witness whereof I hereunto set my name in presence of two witnesses.

GEORG WILI-IELM LoNHoLD'r.

Witnesses:

REINHOLD WEIDNER, MAX WAGNER.

